Evidence for an Exotic Baryon State, Theta+(1540), in Photoproduction Reactions from Protons and Deuterons with CLAS
V. Kubarovsky, S. Stepanyan
Abstract
CLAS photoproduction data on deuterium and hydrogen targets have been analyzed in a search for an exotic baryon state with strangeness S=+1, the Θ+ (originally named the Z+). This resonance was predicted recently in theoretical work based on the chiral soliton model as a lowest mass member of an anti-decuplet of 5-quark states. The reaction gamma d --> pK-K+n, which requires a final state interaction inside the deuteron, was used in the analysis of deuteron data. In the analysis of proton data, the reaction gamma p --> pi+K-K+n was studied. Evidence for the Θ+ state is found in both analyses in the invariant mass distribution of the nK+. Our results are consistent with previously reported results by LEPS/Spring-8 collaboration (Japan), and by the ITEP (Moscow) group.
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